package com.itheima02.map;

import java.util.Hashtable;

public class Demo1_Map {

    public static void main(String[] args) {
        /*HashMap hm = new HashMap();
        hm.put(null,null);
        System.out.println(hm);*/

        Hashtable ht = new Hashtable();
        ht.put(null, null);
        System.out.println(ht);
    }
}
